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21  Alternate cryptocurrencies / Altcoin Discussion / Re: *** Complete Guide on How to Create a New Alt Coin Update 2018 *** on: April 29, 2018, 08:47:42 AM
May I know which version of bitcoin core you are using?


I was using latest version, or v0.16.0 to be precise.
22  Bitcoin / Development & Technical Discussion / Re: API For Bitcoin , Ethereum and Dash Coin from Own Deployed Node on: April 24, 2018, 02:48:47 PM
What about the blockcypher or Insight- APi which can be deployed.

I believe these two are bitcoin based explorers, you will have to fork it to work on ethereum and dash. For example, check out for how litecoin forked insight: https://github.com/litecoin-project/insight-lite-api
23  Bitcoin / Development & Technical Discussion / Re: Output in coinbase transaction on: April 24, 2018, 10:31:17 AM
For example this Coinbase transaction has an output of 0

The output script is
Quote
Null script or error decoding
52534b424c4f434b3addbf517adf8ffd4bca7751505b39c9013a0d1fd479fc4e901b39dd57b347c 624

It's an invalid script why is this not rejected in the first place?
24  Bitcoin / Development & Technical Discussion / Output in coinbase transaction on: April 24, 2018, 12:16:37 AM
It appears that the output in a coinbase transaction are of the same structure as other transactions - both value and output script can be set.
I know it is of one's best interest to set output equal to current block reward plus all transaction fees, and it certainly can't be more. But can it be less? For example, current block reward is 12.5, and say all transaction fee sums to 0.5, can coinbase output just be 12.5? Or even 10? Is this valid situation and will get confirmed?
If the answer is yes, then what really happens here? Do some coins just disappeared forever? Does the total bitcoin money supply decreases also?
25  Other / Meta / Re: Why normal post are deleted? on: April 23, 2018, 01:42:41 AM
Moderators of that section are very strict.

Quote
I use bitcoin core version 0.16.0

Can i change my bitcoin.conf file, so that i can get bitcoins in testnet from mining?

Your answer:

Quote
If you want some testnet bitcoins to test your application, you can also use the faucet services to get some coins, you can google "bitcoin testnet faucet" to find out.

I don't think that OP was looking for testnet Bitcoins from faucets.


All right then, that';s indeed strict! lol
26  Other / Meta / Re: Why normal post are deleted? on: April 23, 2018, 01:13:43 AM
Thanks for helping, the whole thread isn't trashed, it's still there: https://bitcointalk.org/index.php?topic=2961634.0

The message I received is: (including my reply)

Quote from: Bitcoin Forum
A reply of yours, quoted below, was deleted by a Bitcoin Forum moderator. Posts are most frequently deleted because they are off-topic, though they can also be deleted for other reasons. In the future, please avoid posting things that need to be deleted.

Quote
If you want some testnet bitcoins to test your application, you can also use the faucet services to get some coins, you can google "bitcoin testnet faucet" to find out.

27  Bitcoin / Development & Technical Discussion / Re: Can coinbase transaction contains multiple destinations? on: April 23, 2018, 12:55:34 AM
Can coinbase transaction contains multiple destinations, or does it have to be one output? For example, for the current reward 12.5, if set the coinbase tx to send 10 to one address and 2.5 to another, is it a valid coinbase tx and will it get confirmed by the network?
Yes, you can have a coinbase transaction with multiple outputs. The sum of the outputs just needs to be less than the block reward (block subsidy plus transaction fees).

Thanks, another question, can the coinbase output be P2SH address? And can it be segwit?
28  Other / Meta / Why normal post are deleted? on: April 23, 2018, 12:53:41 AM
Why is my post is deleted? They are normal, nospam, ontopic to the thread. I tried to reply the deletion message, but no sender is shown, I don't know why the moderator is. Is this normal?
29  Bitcoin / Development & Technical Discussion / Can coinbase transaction contains multiple destinations? on: April 23, 2018, 12:31:37 AM
Can coinbase transaction contains multiple destinations, or does it have to be one output? For example, for the current reward 12.5, if set the coinbase tx to send 10 to one address and 2.5 to another, is it a valid coinbase tx and will it get confirmed by the network?
30  Bitcoin / Development & Technical Discussion / Re: API For Bitcoin , Ethereum and Dash Coin from Own Deployed Node on: April 22, 2018, 01:11:00 PM
We do want to have API function from the Node of Bitcoin, Ethereum and Dash Deployed on My Cloud Servers Separately.
Is this any additional add up API Protocol for them.

Those are different blockchains with different APIs, so for each coin you need to encapsulate based on its own API, there is no single api that can work on three different coins.
31  Alternate cryptocurrencies / Altcoin Discussion / Re: Script based coin forking reward balance issue on: April 21, 2018, 03:25:09 PM
What do you mean by "last created account's address", can you elaborate?
How does your script work, does it work the same way as bitcoin's script language?
32  Bitcoin / Development & Technical Discussion / Re: How the genesis block triggered on: April 21, 2018, 08:04:19 AM
Besides the answers, you can actually mine your own genesis block, by the same way you mine non-genesis blocks, when you mined your own genesis block, you are essentially creating a new coin and blockchain.
You can refer to https://bitcointalk.org/index.php?topic=181981.0 for a simple program on how to mine genesis blocks.
33  Bitcoin / Development & Technical Discussion / Are private keys and mnemonic code one to one? on: April 21, 2018, 01:26:49 AM
Do each private key corresponds to one and only one mnemonic phrase? and do each mnemonic phrase decode to the exact same private key always?

According to https://en.bitcoin.it/wiki/Private_key#Range_of_valid_ECDSA_private_keys, not all 2256 bits numbers are valid private keys, what about mnemonic phrases? Does all permutations of the words calculates to a valid private key? If not, does wallet software try multiple times to generate a valid phrase?

34  Alternate cryptocurrencies / Altcoin Discussion / Re: Earn Free ETH 2G for joining Telegram on: April 20, 2018, 03:20:48 PM
How and what is ETH 2G different than ETH 1G?
35  Alternate cryptocurrencies / Altcoin Discussion / Re: *** Complete Guide on How to Create a New Alt Coin *** on: April 20, 2018, 03:09:09 PM
I made an update to this post, based on latest bitcoin codebase, please see https://bitcointalk.org/index.php?topic=3345808.0
36  Bitcoin / Development & Technical Discussion / Re: How exchanges make wallet adresses? on: April 20, 2018, 03:06:23 PM
For online bitcoin wallets, most exchanges will use HD(BIP32) wallets, it will generic the extended key offline, store the correspondent public key on the server, and it only needs to allocate an index number to each user, then new addresses can be generated on the fly whenever user requested a new address.
By using HD wallets, it is much easier to manager, because there is only one private key. Also it is much simple to operate, because each user can have as many new addresses as they want, technically 232-1 addresses, and no private key is needed to generate new addresses.
Then what if the alt-coins that does not have HD wallet features?

And most exchange just give 1 address for each coin per 1 user. And user also does not need more than 1 address. And it(multiple addresses per coin per user) only confuses and make it complicated to manage from point of view of exchange.

Are there any actual reason for give more than 1 address?

So point is, you saying about make bunch of addresses before (like 1 million addresses) and store them in DB?


If a coin does not have HD feature, then you will have to go to the old way, i.e. pre generate lots of keys and addresses, and assign them to customers.

Actually, uses DOES need multiple addresses, most exchanges let the use generate new addresses as they want.

The point of HD is, you don't make bunch of address beforehand, you can generate new addresses on demand, but you neither store multiple private keys(only one master key), nor do you need to store keys in db, you just need to store the hd key path. When transactions are needed, you can always generate keys from the key path.
37  Bitcoin / Development & Technical Discussion / Re: question on finding nonce on: April 20, 2018, 02:57:21 PM
Agree, as the nonce is like randomly located between 0 to unit32_max.
when miner divide the work to each gpu,
does it divide in a way that they won't overlap?

Most likely. What the point of computing twice the same thing by the way?

I have a gpu miner with mixed gpu. 1080, 1060 6GB and 1060 3GB.
if miner divide the nonce evenly to each gpu, the chance of finding the nonce will be also the same for each gpu.
however, i can see 1080 finds more share than 1060. as 1080 is much faster.
I suspect each thread are trying the nonce randomly.

Those are mining hardware, what software do you use? The allocation of the work is done by the mining software. I believe an intelligent mining software will use each GPU's capacity as a hint on how much work they are assigned to. Infact, it's a process of  feedback and adjust constantly. The miner will measure each chip's hashrate and decide whether to increase or decrease the work.
38  Bitcoin / Development & Technical Discussion / Re: How exchanges make wallet adresses? on: April 19, 2018, 11:58:31 PM
For online bitcoin wallets, most exchanges will use HD(BIP32) wallets, it will generic the extended key offline, store the correspondent public key on the server, and it only needs to allocate an index number to each user, then new addresses can be generated on the fly whenever user requested a new address.
By using HD wallets, it is much easier to manager, because there is only one private key. Also it is much simple to operate, because each user can have as many new addresses as they want, technically 232-1 addresses, and no private key is needed to generate new addresses.
39  Bitcoin / Development & Technical Discussion / Re: question on finding nonce on: April 19, 2018, 11:51:02 PM
First, yes, mining is running the nonce from 0 to uint32_max, to find the value that the resulted block hash is less than the target.
It's not random because it won't help anything, you still have to "randomly" try every possible nonce value.

For multiple GPU, it's just like multithreaded processing, the miner software will divide the work to smaller tasks and distribute to each gpu.
40  Bitcoin / Development & Technical Discussion / Re: Error when starting daemon on: April 19, 2018, 01:56:43 AM
The message indicates that the genesis block is different than the one stored on disk. Try remove contents of the datadir, by default, it is ~/.bitcoin, and try again.
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